Answer:

a) if the water vapour in the air increases then the air becomes more moisture

b) the soil loses its nitrogen content

Answer:

a) if tye amount of water vapour increases in the air rapidly , the related humidity

increases and vice versa .If the water vapour content stays the same and the temperature rises , the relative humidity decreases.

b) If one crop is grow repeatedly in the soil then the fertility of the soil will not exist as same as before and can lost its nutrients.

So for this crop rotation ( changing of crops of certain places ) can be a cure for this...

Hope it helpsss u..